What EPA's radon map says about White County

White County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and White County lands in the 83rd percentile for radon potential.

White County by the numbers

About 24,833 people live in White County, Indiana, spread over 505.181 square miles. Averaged across its land area, White County runs about 49 people per square mile. Among counties sharing White County's EPA zone, it outranks 51% of them by population. Geologically, White County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — White County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Some White County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Testing and mitigation in White County

Mitigation cost doesn't depend on White County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Indiana's state radon program

White County's test kit answers today; a Airthings radon monitor keeps answering for White County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

White County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone White County carries, the zone explainer covers what it does and doesn't tell you about any one house.